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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
1727 | if ( $test = @parse_url($link_test) ) { |
1728 | if ( isset($test['query']) ) |
1729 | $post_links[] = $link_test; |
1730 | elseif ( ($test['path'] != '/') && ($test['path'] != '') ) |
1731 | $post_links[] = $link_test; |
1732 | } |
1733 | endif; |
1734 | endforeach; |
1735 |
|
1736 | do_action_ref_array('pre_ping', array(&$post_links, &$pung)); |
1737 |
|
1738 | foreach ( (array) $post_links as $pagelinkedto ) { |
1739 | $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048); |
1740 |
|
1741 | if ( $pingback_server_url ) { |
1742 | @ set_time_limit( 60 ); |
1743 | // Now, the RPC call |
1744 | $pagelinkedfrom = get_permalink($post_ID); |
1745 |
|